If you want to understand Nikola Tesla a little better & in his own world, you might want to read his “Auto-Biography.” The fact that he thought in pictures is not abnormal. As a matter of fact, that is supposed to be a “trait” of most engineers. Not everybody uses their brains the same, just as not everyone has the same skeletal-muscular systems & therefore do not exhibit the same physical performance. Some people tend to think in words & use their left-brains more, whereas other people process mental activity more in pictures & tend to be right-brain dominant, which is supposed to be the “creative brain.” Those that use both of their left-&-right-brains in “synchronicity” can consider themselves fortunate. The good news is that our brains can be developed, just as our muscles can.